SN75LBC771 GeoPort™ Transceiver |

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GeoPort™ Transceiver

GeoPort™ Transceiver - SN75LBC771


The SN75LBC771 is a low-power LinBiCMOSTM device that incorporates the drivers and receivers for a 9-pin GeoPort host interface. GeoPort combines hybrid EIA/TIA-422-B and EIA/TIA-423-B drivers and receivers to transmit data up to four-Mbit/s full duplex. GeoPort is a serial communications standard that is intended to replace the RS-232, AppleTalk, and printer ports all in one connector in addition to providing real-time data transfer capability. The SN75LBC771 provides point-to-point connections between GeoPort-compatible devices with data transmission rates up to 4-Mbit/s full duplex featuring a hot-plug capability. Applications include connection to telephone, ISDN, digital sound and imaging, fax-data modems, and other traditional serial and parallel connections. The GeoPort is backwardly compatible to both LocalTalk and AppleTalk.

While the SN75LBC771 is powered off (VCC and VEE = 0), the outputs are in a high-impedance state. Also, when the shutdown (SHDN) terminal is high, all outputs go into a high-impedance state. A logic high on the driver enable (DEN\) terminal places the outputs of the differential driver into a high-impedance state. All drivers and receivers have fail-safe mechanisms that ensure a high output state when the inputs are left open.

The SN75LBC771 is characterized for operation over the 0°C to 70°C temperature range.

H = high level, L = low level, X = irrelevant, ? = indeterminate, Z = high impedance (off)

-0.2 V < VID < 0.2 V


  • Supports a 9-Pin GeoPortTM Host Interface Standard for the Intelligent Network Port
  • Designed to Operate up to 4-Mbit/s Full Duplex
  • ±5 V Supply Operation
  • Provides 6 kV ESD Protection
  • Has Driver Short-Circuit Protection
  • Includes Failsafe Mechanism for Open Inputs
  • Is Backward Compatible with AppleTalkTM and LocalTalkTM
  • Combines Multiple Components into a Single Chip Solution
  • Complements the SN75LBC772 9-Pin GeoPort Peripheral (DCE) Interface Device
  • Uses LinBiCMOSTM Process Technology

    GeoPort, LocalTalk, and AppleTalk are trademarks of Apple Computer, Incorporated.
    LinBICMOS is a trademark of Texas Instruments Incorporated.


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Part number Order Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
SN75LBC771 Order now 0 to 70     SOIC | 20     20SOIC: 132 mm2: 10.3 x 12.8 (SOIC | 20)